Method of smoothing shoe parts



Jan. 31, 1933. J. SANDT METHOD OF-SMCOTHING SHOE PARTS Filed Jan. 6,1930 2 Sheets-Sheet l Jrzverztor Jan. 31, 1933. J -r 1,896,017

METHOD OF SMOOTHING SHOE PARTS Filed Jan. 6, 1930 2 Sheets-Sheet 2J/werztor:

Patented Jan. 31 .1933

UNITED STATES? JULIUS sum, or nnkasmrs, GERMANY METHOD or smoorn rnesnon rears Application filed January 6, 1930, Serial No.

This invention relates to a method of treating shoes, parts of shoes, inorder to remove folds and unevenness in the leather and to obtain anexact fit on the last or the like. This is obtained accordin to theinvention by blowing a current of ot air of about 200 or morecentigrades on the uneven parts of the leather. Hereby the leatherbecomes smooth by shrinking of its surface without impairing itselasticity or its durability. In a similar way the folds of theleather-cover of wooden heels at once disappear as they are blown by hotair. The new method makes it also possible to level and to iron shoeswithout lasts or another inner support.

It is known to treat shoes with a sad-iron for the same purpose. But thesad-iron cannot enter into the grooves of the folds as does a current ofhot air. On the contrary it lies only on the folds; Besides it preventsthe observation of the work-piece and the work piece must be supportedby a jack in order to be worked upon by an iron. The use of an openflame would be troublesome and danger- 5 ous and would hinder theobservation. In

contradistinction a dirigible current of hot air is easy to handle andallows the observation of the disappearing of the folds during thetreatment and prevents an overheatingof the leather.

The drawing shows a preferred embodiment of a device used for executingof the method.

Fig. 1 shows a section of the device along its middle plane and adiagram of the wiring.

Fig. 2 showsthe whole arrangement of the device with the means forcooling of the guide of the shoe in section.

Fig. 8 shows another arrangement for the cooling of the margin of thesole.

A pistol 1, see Fig. 1, is provided with a heating-body 2, the front-endof which is directed to a nozzle-like opening 24 for discharging theair, while the rear end is easily accessible by a removable cap 3. Inthe cap 3 is fastened a mandrel 4supporting the heating-body 2. ,Acasing 4' prevents the radiation of the heat of the heating-body 2 ontothe wall of the pistol and divides the interior of the pistol in aproper heating-room 20 and 418,943. and in qermany hnuary'la, 1928.

a re-heating ch mber 21 or the fresh air whlch enters the pistol-stock 6through the metal-hose ,5. The fresh air is introduced into the pistollby' a ventilator {F.see Fig. 2, through'a flexible hose 5. .As .seenfrom the .dlagram the heating and the supply of air can besimultaneously a controlled by .the switchbutton 8. The,electric-leads'are securely embedded in the ducts 5, .6 for thecompressed air. I In order to protect the margin of the soles which arepolished with wax against the influence of the hot air, theheating-piston may be provided according to Fig. 2 with a cooled gudellqfor the margin of the Sale. The gu de has ,theforni' of a rollrotatable on the axis 12 on the swinging lever 9. The lever is capableof beingswungabout the axis 10 on the p stol-body and is pressed againstthe margin of the sole 15 by the spiral spring 13. 1.

The prolongation 9 of the lever 9 abuts against the dog 1' of thepistol-body and limits 1n this way the swinging-movement.

At the lower end of the pistol-stock is branched-off the curved pipe 14which sup phes the cooling-air to the guide-roll 11. If another part ofthe upper leather is toobe levelled the swinging-lever 9 with the roll11 may be withdrawn from the nozzle of the heating pistol by means, ofthe handle 11.

The device for protecting the polished solemargin of the work-piece 15may also be arranged separately from theheating-piston according to Fig.3.. With this arrangement a frame 16 is attached to the work-table, and,85 the fresh airis supplied to the guide-roll 17 by means of themetal-hose 19 through the closed hollow-space 16 of the frame. Thework-piece may now be guided along independently from the position ofthe heating 5 pistol on the roll 17 rotatable on the bolt 18. The solelies on a table-like arm 22 of the 'frame 16.

object to be levelled, and with the other hand 1, 7

he directs the current of hot air against that part of the leather whichis to be smoothed. The current of hot air may be controlled with regardto its velocity and to its temperature. 5 Of course the device may beconstructed in a different manner. For instance the ventilator may bearranged in the pistol itself. The discharge-opening of the pistol mustin every case have the form of a nozzle. The same ventilator may alsosupply air to several pistols.

What I claim is: 1. Method of smoothing folds or uneven parts of shoes,comprising the step of blow- 1 ing a jet of hot air against the parts tobe treated while'keeping the latter in a visible position.

2. Method of smoothing folds or uneven parts of shoes, comprising thestep of blowing a jet of air of more than 200 centigrades against theparts to be treated while keepin the latter in a visible position.

3. Miethodof smoothing folds or uneven parts'of shoes, comprising thesteps of pro- 2 ducing compressed air, heating the com pressed air,anddischarging a jet of the heated compressed air against the part to betreated while keeping the latter in a visible position. In testimonywhereof I afiix my signature. JULIUS SANDT.

